package Lanqiao.猜字母;

public class Main {
    public static void main(String[] args) {
        StringBuffer s = new StringBuffer("abcdefghijklmnopqrs");
        StringBuffer ans = new StringBuffer();
        for(int i=0;i<106;i++) ans.append(s);
        while(ans.length()!=1){
            StringBuffer temp = new StringBuffer();
            int n=ans.length();
            for(int i=1;i<n;i+=2){
                if(i>=n) break;
                temp.append(ans.charAt(i));
            }
            ans = new StringBuffer(temp);
        }System.out.print(ans);
    }
}
